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(No Model.)

J. J. BLAIR.

ROTARY ENGINE.

Patented July 10, 1883.

ATTORNEYS.

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ATENT vrrica JOHN J. BLAIR, or TOGOMA,

ROTARY:

SPECIFICATION forming part of Letters \VA SHINGTON TERRITORY.

ENGINE.

Patent No. 281,004, dated July 10, 1883.

Application filed August-30, 1889. No model.)

To all whom it may concern:

Be it known that 1, JOHN J. BLAIR, of Tocoma, in the county of Pierce and Territory of Washington, have invented a new and Improved Rotary Engine, of which the following is a full, clear, and exact description.

My invention relates to the class of rotary engines employing pistons in connection with an annular steamway; and the invention consists in certain'novel features of construction and arrangement of parts, especially in the means of supplying steam for the operation of the valves and gates, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in. all the figures.

Figure 1 is a side elevation of my improved rotary engine, the case being broken open and certain parts made in section, in order to sh ow the interior construction. Fig. 2 is a transverse section on line a: m, Fig. 1. Fig.3 is a detail section in larger size.

A is a hollow ring or annular steamway, which is formed by the two rings a. a, which are bolted together, and are also made with flanges for their attachment to a suitable support.

B is the shaft, which is formed hollow and provided with an interior partition, as shown in Fig. 2, so as to separate the ends of the shaft, one end, I), bein for the inlet of steam and the other end, 0, fo; the exhaust.

d d are arms projecting from the shaft B opposite sides.

At its inner periphery the hollow ring forming the steamway is formed with acontinuous slot, and in this slot is a slide=ring, f, which connects by means of links 9 to the arms (1 (Z of the shaft. This ring f is packed in the slot by means of a packinggland, as shown in Figs. 2 and 3. The pistons h h, of which there are two, are connected with the ringf. The steampipes h extend from opposite sides of the shaft through the slide-ring f and project into the 'steamway in front of the pistons, and from that point they are continued to and through the pistons, so as to discharge the steam behind the pistons. The exhaust-pipes'i i pass from the hollow shaft and connect withthe steanr way through apertures in the ring f.

Exteriorly of the steamway are the valve cases or boxes D, which are three in number and placed equidistant.

The valves or gates K are of circular form, as shown in Fig. 3, and are formed with rabbeted edges to fit in slots formed in the boxes D, which serve to guide the valves in their movement. The valves are attached upon the ends of the stems I, which extend through stuffing-boxes at the outer ends of the boxes D, and are connected to links in, by which the valves are operated by cams, as hereinafter described.

In the steam-pipes h are rotary th rottlevalves 0, on the stems of which are arms 1). Attached upon arms projecting from the hollow ring A is a grooved cam, E, the groove of which is engagcd by friction-rollers upon the ends of the valvc-armsp, so that the cam serves to open and close the valves the proper time.

F is a second grooved cam, which is attached to arms from shaft B, and this cam engages one end of levers 0', that are also connected to 7 5 the rods m of the valves or gates it. Both cams E and F are shaped to open the steam-valves and move the gates k at the proper time, and

in the engine shown, using two pistons, these valves are opened and closed three times in So each rotation.

By the arrangement of parts shown the steam is cut off at the half-stroke of each piston, so that the piston runs one-half the time by expansion of the steam, and while one piston is moving by expansion the other is under full pressure. The slide valves or gates are moved at a time when there is no pressure upon them.

In the operation of the engine, as one piston reaches a gate the gate is drawn back and the 0 piston passes, moving at that time by expansion, and after the piston has passed the gate the latter closes, and at the same moment the exhaust-piped in advance of this piston is carried past the next gate, thereby relieving the 9 5 pressure from the second gate, and the steamvalve being opened at the same time to admit steam behind the first piston. That piston then moves forward under full pressure, while the piston following is moving by expansion. I00

An alternate operation by direct pressure and by expansion is thus obtained upon each piston in succession, and a continuous pressure and rotary motion obtained.

This engine will develop a comparatively large amount of power for the steam used. In order to strengthen the pistons, they are formed at their forward sides with braces S, to sup port them against the steam-pressure.

Having thus described my invention, I claim as new and desire to secure by Letters Patent' 3. The combination of the hollow ring or steamway A, the sliding gates'k, the pistons h, the hollow shaft B, the steam and exhaust pipes h z, the cams E F, and the connections for operating the gates and steam-valves, substantiallyas described, for operation as set forth;

4. The combination of the hollow ring or steamway A, the pistons h, the steam-pipe 71, hollow axle B, steam-valve 0, and fixed cam E, operating the steam-valve, substantially as shown and described. a

5. In a rotary engine, the combination, with a fixed steamway, of a hollow axle for supplying the steam, a fixed cam operating the steamvalves, and a revolving cam operating the sliding gatesof the steamway, substantially as shown and described. p

' JOHN J. BLAIR.

witnessesi SAM-L. (J. Howns, S. 0'. ALLTON. 

